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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4cdfdacc77f96c99b5739a24ec9206434324646f80d3c25557a9ba009c6fd7c' 
  AND token = 'xNOVlDMUwHD47A+NJd3Uy5GUUh/lW9hT8+R4hc/7Ys8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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