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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c596066f1b5e7b031015ef0516cce441b619c2ffa5b0a0c71c69d1775ed11c' 
  AND token = '6UYqv6nu/5YeokuGewtMv/q2WkSGSSpqGHQ/SoAvrkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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