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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e090237967820cca7395d28a186786439ba357e292736dbd2d7371bbb316e34' 
  AND token = '9ArZtt4Fs7u+V6Pzhf9JtHclpd3EXpVFSWv3gGe8h6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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