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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '274c41745ba8947f303537382f95709297851ca5e13dbc30d16ebda39742e8b0' 
  AND token = 'efes1raeCj+8wMyWW3BUIqpenvoEw3VsWwU6ggDUQME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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