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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0322f19286dae180778b831f73914f99600d7298075aec9c3a36d18b4bac18d5' 
  AND token = 'mUlPu56NH4KQbVEDIYQ6WeBhE2p3EYdPg8URdTz+Qeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}