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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14545e625f5cc03e96f11bbf712002e1cd9ccb6259048c4f7a54c7429b013b5' 
  AND token = 'hzBxJBSqb3Ed+divXl5ZKd19dDhG13eLlckpEosD9kI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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