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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '778bd8332b0cbc4547409a6962542fcac34d7334e56a710cc8bd16e0871b7090' 
  AND token = 'aPCxGo69NCc8y1S+H5VX3P/iAvcNJ06F75YUXREmcY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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