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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0dc552c0aa03a7990012118f34c0b69bb6c96df1c4f7f19f4469bf70244fe0' 
  AND token = '95GUYexX6jxXcuCwcIrlH8WxjOy851/WON9DRjsx8HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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