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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d128e9472780a5546ae424a2571974854a124050d26204feba6ea1afad239d' 
  AND token = 'gTgaJTCCqL7uo9D8YFyMO0Z4/jQ7pf0rzFDAR4BckOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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