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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff104786571cb57f6b496b87a68b0fcf116597ce9e82cfe46430b6f6b42c521a' 
  AND token = '8oHf+R4tYcvhVwxAGNgL0CCiXXdIFEmyx39YKD6WSH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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