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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0742b8496e359006f8d3a141d14475dd17c49266c480fcdb93c1b3b98d86f10d' 
  AND token = 'Qc4oKaxY1MwJoyXJzpy6118rrYx6zU2X7wFN2dFv630=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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