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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d8ee3663f3d5870d385692bb0682531892cf93aa835030534ff4f1b50f0957c' 
  AND token = 'bJSAMnYjl4rOi3cFpWK44IzkJ813EaLGPtErrIsig2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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