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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0bc7dea426f04944aa942f25abe4e679f2b52b1cc514bf470e82487ebd49cb' 
  AND token = 'mOHRLUm+GexWCxSckbeYYyigwex/kUX3PXuGA2wzGYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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