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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64bb4f0f3ab10d8818c5940e52594eddf9229870e6854343f292a4c4a46c7af3' 
  AND token = 'QetxBDwI2gnOPPl6MuCDXJUlOFascH1PsxROL6qcBt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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