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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70522709560e06a00c74b06ac80c4d808c37433372095ffe428d771383794484' 
  AND token = '8kOholfOoLw/8KHcqOCcXH8mnUUOG7L8hPnQ/DmnenQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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