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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29cb9d7f1a16f08a8a9e6d46e28b591dc3ca454385e1abaf905648a55c11b4d' 
  AND token = '5bEgfV63nZbILJcmKFjI3dnSrnPaNvj//WjTKYvNnA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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