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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9047bc95e626e16366dc213b43d873fdb5c380a14eec5264993962f7ca53ec2' 
  AND token = 'Ul1XWRxM9J+rgq8DtOlrP2Z0MPCrllQ0cZx9iS72XBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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