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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68324d632f1eb9e95a6b16837fdbb4cdc63b85f4e30c65d69ca430ce41170af4' 
  AND token = '20EXMbXas/xySeDs/AYwb3AJE6Q50nNxMbOOGFPDAwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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