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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746adee58828b3dfe80508b44a7c05d59bef6ccdcbb355f7dbee01d31ec66b14' 
  AND token = 'WY2IbUSUFXcQ0CRUExGhtwxaYLO15aVTV/sME9Cgkoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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