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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a694709e083cd746b173262b81c131ff715abfadf84ea9f582be40b1e45a85' 
  AND token = '9khv5L6gm5OQP0NgcQuFj874dTs8CTDcX6MCcW6xe7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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