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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1affc952650a46cece4c940f6bc927e83130d511a1bb7ca0374d6836ece076' 
  AND token = '6q+YCU7LsFci8y7yzXeapqQkDRUH5HFRNbxrtmLfSCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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