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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0997b4aff8e4551151bb2fdcff90b551ecbc5a91d23915fe90bdc2d49b1f73f' 
  AND token = 'yemn3Xjd0NK6FP8m9bcUZcTOMJRVKy1JCwYBZPBTFR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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