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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3244bb4bdb4491991956c2f1804019fa19985e996cc775d5a6f7a0bbf90debb4' 
  AND token = 'inv8J4iNbFITz7ChI9ZlzcRXj9f+4cfSTdX8BK4L82A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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