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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eee01153d9d97ec974d9ebf8ef767a7e6c30a3c896f4033606cb1bb7c0fdf1f' 
  AND token = 'zc6THUNuLKiWykRm7nu7wgXsOU6mIRxXKjC4Plgdnhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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