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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d92525bd755276fd2caff366dd9b0922e56415ec421b5fad8b10ef581bdb91d' 
  AND token = 'm3IkHBFX1idfMO0vQ2K7+HhhZphwFZT5MFz3bmFUZ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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