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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d149aaa3d12acb0eb4c8fd3e8ac376434182a99585ffade8056c55d69a5cd3' 
  AND token = '8mErx4jnOhqpBL02l/c7l5u3UX5zXCOxjY96DcuQ3Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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