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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7323389811fdba0107e13e8aacc8de329ced7751317026b595c4757c5cf6ec25' 
  AND token = 'RVAkhFwFE0mu0YbFlI206tHFwt8+nQq2/gtS37s/iT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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