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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974acf7b8d5f461f9269de9c935e82092afbc044ef3c2bc2bcbbdc0aba5ce1fc' 
  AND token = '5i8IOfjKzvg8DVRr9uDo2kt6OhGfTn+V49qeSl6uxQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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