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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1048fa6fb99c1685aced1a851cc34704fd740fed8be7958905c43dc9192d2dc9' 
  AND token = 'HrCq3UHubSwFc+72kPvOIhHLAa7DZu5EM32lB8BZsJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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