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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b7337808a9ff4db6caa58814cd5dafc03ae11c2c0ac9877dd3462944705cae' 
  AND token = 'QvXWUa89Vg73rg9IywxKwH7OF8H3mQ68G/FqZl3QyCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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