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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79333e144f9cf7b6c32ab1241ca2cec8be487c7ac829fd028e28e444e913eee' 
  AND token = 'iQ6FQynDdYRTebPuXhxdhw2/F2RMT5KeFowz4c6lq+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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