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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dba6a8c0d542991ca97a512de084152835c74c013e592d361310248c5ff194' 
  AND token = 'SBTWncCSmKj5SSXNrJx/Y8Tak9OmPmiem6J44qReoDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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