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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2094b873e34715cc3c992d9dcca3f075e274d67fb857091fb6225582a2e3c52d' 
  AND token = 'YUwzOXSiPsGIFXU+2p9oWCAs4Dx/mSG82XmTTdOV01o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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