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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244f8ffa183cc8cd223cd7ff833f40ee36faaaedde68a8123b0df681e869d23f' 
  AND token = '3ixaKqoi+PHP71rzzd4L2S9kNNANOpTMSghiLFXtRkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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