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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f6473accb01d108fb21e49e4092a199bd0f7d041416d9de6c9b7e031288b63' 
  AND token = '+vAccJt2PBFf3VtzbUy5Gwr3JbnSxdneqAnIJlzec3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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