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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba1e0ed0e2747dc07a75865c431f5d24d0c1b0ae8fdaf7d745ae56bd5f4d527' 
  AND token = 'B6JK4rmJFx+j7IdzdBB36MnRSPz2O8G7z4qIXObeIis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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