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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b60f05b6d5f7952cce897d7a1a7802ae591472d3675e69c2d7480853391b97' 
  AND token = 'wnOJa0OdB+Kr1ee61lqfuiEt+mz9TTfaNHEhNRdveZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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