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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33a6c8962e7d6d957fadf0fa56c6f52927e6d44a4e7813ce86fb9a85ffda160' 
  AND token = 'emx6ja8qaI1ZHNFAVUAj7O7Dcd7ulHWtxyvGoWj1vBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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