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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90463e7de5a4f2becebf5457fff333b5a5c9c8508dff7814b3481fd1ab33a64f' 
  AND token = '91W8QhOCBULefNwpl41Vaz1afR5eS2/psLSWhaiUtxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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