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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5113668c9737bf60abb28f7aa86cd2403170656b73d0f2089f270d7f911b76' 
  AND token = '3Ed3XblHo1JL91krQest8MGILhFKLIp/H8KuRzPHeBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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