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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3addc3b91ce74ad4be106bae116218226e4da254eea01083c9be6ea7ab6b5d9' 
  AND token = '9kUFP26eSVC+4kWuNfYKOKto4zmXmdsuWrcpbAdXg1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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