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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1adac40294d21921c1162bb4908d76fac4ddf05343cc7075cccb4ab61c9cbe70' 
  AND token = '0Hh2WO6o9BEvM/KkOacKGeT/4cZ8za5cx9Jrj10LTi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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