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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6210344dd2cc168c9e6b63c86d05b22b5b021b42d90a199c8aaa3cdf0ffc7f41' 
  AND token = 'YBq3EE2ldTn8c8aJ9NIiqksoydqo6nJHSjBQOHMDhi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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