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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafc665f0de702f679dce1a3e97e8a1cd29575cdc7fd4ec7ec3d469593d2397d' 
  AND token = '6J+Z4JGb0cK5RBRfcAnHqvKX9SspBddFrlhrITUY7aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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