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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24143f705df9035f9fba8f6ed6e40c105d1e4ea460185a7d235e3a64c38c0a5' 
  AND token = '5B1HKedMlKRoGiZTVQ8no7uaTNvSNyXutc9dUQWr1kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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