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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e45d91aa59b571bce54ed8332408062ac2ef84e0c6ced853532ba4d386cfbedb' 
  AND token = '2doFmUX/XNtwk0DBUw42iLeriXCQQW6Dx+eaHa6gZ70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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