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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4aac5e6c35687ab06e1d7c684bc6fe08b61325e5d68a9b596692f6e3604519' 
  AND token = 'ZKHxsrEL40VV1OVfknMeV7nELX7Z1cYoHw4Vw1/OHb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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