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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5855e91de52d6ef429ad2cb04a5a2483d937e7eccd2bdfc905284c5185cf624' 
  AND token = 'X23C+RNe1kfN5EDHposiQHusIILuWOm/tEupwWhy27U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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