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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deaa9a5a296b2709657b9d137b64681e072f40b71e67bd6008d4a1a6e9e3d27f' 
  AND token = 'uHK2fZqgYAizZtPNoVAYXPip9ABGv6D6/tRf6ZkH7GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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