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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24413da0a970cbe662240ec13a979c35d2d23f47dbaf39d134d297bc79b5f003' 
  AND token = '2yXf0jPBJx/41l1urZCA6fXejjiTCHfO5B1EWhdOBwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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