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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b616f757cc233b5e18712e15897210f3759939ef79db2471d5a759ededf96b' 
  AND token = 'ksIz4nBrwrWpEQyX+a8seS8a2X6bLiR7m1Xi3VHGSgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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