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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5c5625e20eab09f9c39bfd45d3556fb6a5fae27f3a156f1d2ba6a16226dd2b' 
  AND token = 'E5LXNRtngIkRX3qLIe7OyNK3zxmWSVjeC0zeG1AUY7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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