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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560adee057292022a7d1e74003f9d939cf28ffe60a2b82f2327a0eb3647507cc' 
  AND token = 'h8BYM520Y9PBkhP+dvBYg27Gg0XYoRTXqrJCkg5KJmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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