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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d30de1949b7181363ff9697e76a7b97fdcdf9bcee2eeb2abc224c57721627a' 
  AND token = 'rSJPxz1vNTvTEez63RfwZJIgRdcBXzdPazaV/otNcOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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