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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37ceb86e41e4ddb901791f3dce46870234619bc0687bc156fc4ac8c69a30c882' 
  AND token = '1CnrPpZ9gcW1/bBbKdMq+HsOkj/DLbM3b8nGy3rH+h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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