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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab542b245460eda870fe6509880500ff0ae051f5314410888d8af6bafa54682' 
  AND token = 'KMyFoPtnV3xIJw5+NQbShC1E63Fn4+zReS6dGip92XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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