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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3cb84c6923d5c807d819ed04b5849e7a8ffd07af36b164e1c54821e7def8b1' 
  AND token = '1zwTb48lzFAzBVW3HZPYJQzxpzautIa6jSNbeFhh62c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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