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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ba29c0d28eeb0f954ceb9094b5b793f876252250d04cc7a2c120ca28ef3908' 
  AND token = 'zGh7wEmG7kz+TrzyhD+cmjDSex1mrDhWQ5CP+4TZ8Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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