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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705da4b2915d5a619a0addac17c8d05fdebef41e2cba92f960802ea2f27efb2e' 
  AND token = '519ntFOFVIgw4xYxgHk8aFNz74ZmGpkiBwxzv6SG8Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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