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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9bf0e68fa06378cd3d4afc8ddce4f0361f6d6999b53aee3b92a73df535f7e3' 
  AND token = '0auLGbj7KfY5NUgX0oFIr4+AC9DPL4nkjof2dlvc2k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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