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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdf5f5ddf2ca7125e9cfb84f2c2ae3d7a44ec7a65e1509eb3083737e544bfd18' 
  AND token = 'ka4L15CVy1fFFQvhRSbxb3H69dyJTh52iZnaFaJhTDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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