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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3f5f670d3c03d1334ebcfbffdb97216607dd5283c8d2cc5998a79c1c8669e1' 
  AND token = 'YlNvMKxMg0zW5bgGgziSpoiiqlf9gjznquH47WpYAOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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