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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a004ef15ea0bda272bacf3444b974c372622cb54ae1176d759f3f1bc820a9f7' 
  AND token = 'hxX0GCcxG9BgCl+6xKOQc6XhQxB4BYdWXz9KC8SaKXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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