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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3bf973622afd2f1ec5da5c9c48a42fecc6cb9f64b5e5273464403084bd897f5' 
  AND token = 'fR6+Pxryr6Vt+Q/rfKcHUX9O/ypTfVSkUL+HGaFZLCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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