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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627369d6acfb46d8af4a572eed5184404347367ba3ba96c3fd3b5726e9d98927' 
  AND token = 'FAm1uyrZqIlAQm0nV+m0i+t8ehnw6+f+wQYp6IcUUVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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