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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5448d5efad9f4748aea93189993a4c8707b946c44aabb8c72842ba9bc4d8a82' 
  AND token = 'sLXlmzc15GdI/4WICYAlJKAW9XIlWPXLjCbS8IOnFk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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