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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c4f2502d4b887af726d4b2cc81b96e6495ab87a05a604a8ddf7382258f519d' 
  AND token = 'A0kwzLxkIkng0x4tSD6qRI0t9iDjH1ug0Bj2ufyri/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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