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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6bfae479a5c74e1dcb56c9319b9ddb23051f01223484b6b6ce49d51766a5a6' 
  AND token = 'b/ZYt+ixE8EA1ALZa4EoHHEGskIE7VfuGNwiDE0robk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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